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UNITED STATES PATENT OFFICE.

MAKIANG PART- PLATED IRE.

SPECIFICATION forming part of Letters Patent No. 374,097, dated November 29, 1887.

Application filed January 17, 1887. Serial No. 224,543. (No model.)

To all whom it'may concern.-

Be it known that I, AsHB L T. WALL, of Providence, in the State of Rhode Islaud,have made certain new and useful Improvements in the Process of Makin g Partially-Plated Hollow Wire or other Hollow Articles; and I do hereby declare that the following specification, taken in connection with the drawings making a part of the same, is a full, clear, andexact description thereof.

Figure 1 is a view of the ingot with a partial plating of gold soldered thereon. 'Fig. 2 shows a cross-section of same after being rolled. Fig. 3 is a cross section of wire formed from the plate shown in Fig. 2. Fig. 4 is a crosssection of another form. Fig. 5 is a cross-section of another ingot'with gold plate attached. Fig. 6 is a view of same after rolling. Fig. 7 is a cross-section of three-cornered wire formed from plate shown in Fig. 6.

My invention relates to the production of wire used by jewelers and others in the manufacture of ornamental articles, and has for its object a material saving in the amount of gold stock used; and it consists in so manipulating the materials that the plating will be confined to the parts remaining exposed after such wire shall have been attached to and become a part of some device or article.

It will be understood that in rolled-plate goods it is only the outer or exposed portions that are required to have a gold surface, and

that any gold stock otherwise used simply increases the cost of the production without adding to the value or desirability of the article. In the processes heretofore employed it has not been possible to confine the plating to any desired portion'of the product, and thus save the wastes of stock.

In the drawings, A, Fig. 1, is an ingot of base metal having aplate of gold, B, soldered thereon.

C, Fig. 2, is the plated ingot rolled down to the desired thickness.

D and E, Figs. 3 and 4, is the sheet represented in Fig. 2, formed into hollow wires of different shapes, the one being round and the other square in cross-section.

F, Fig. 5, is another ingot with plating attached thereto. G, Fig. 6, is the'same rolled down; and H, Fig. 7, is the same formed into desired shape,

or part thereof hollow wire, triangular in cross-section.

In my invention I first determine the location of the plate upon the ingot of base metal, having in view the particular form or shape of the wire to be produced and its subsequent exposure, then roll down the whole to the desiredthickness, and finally form it into the as shown, for example,in Figs. 3, 4, and 7. If the plate is properly located upon theingot of base metal, it will be found, upon the completion of the hollow wire, to cover only such portion thereof as will be exposed after it has become a part of the manufactured article.

After the hollow wire has been formed, as described, it may be drawn down in the usual way. Such drawing down, however, will not extend the plating circumfereutially, butonly longitudinally in proportion to the longitudinal extension of the hollow wire. After the partial plate has thus been longitudinally extended the plate of base metal, with its'partail covering, is drawn through a die to produce the hollow wire or stock. This same principle may be employed when it is desirable to place upon one portion of the wires circumference a thick plating, leaving upon the other portion a thin plating. In such case the plate of base metal having a thin plate of gold secured to one face will have the gold plate required to make the thick plating on one side placed and brazed thereupon, and it will then be rolled to the uniform thickness and then shaped into a hollow wire .or other article.

What I claim as my invention, and desire to secure by Letters Patent, is

The herein-described mode of making partially-plated hollow ware,consistiug in brazing to one side of a flat plate of base metal a strip or plate of gold coveringa portion only of said side, rolling the compound plate to uniform thickness and extending it lengthwise, then bending and drawing it through a die to produce a hollow wire or stock, for the purposes described.

A T. WALL.

Witnesses:

WALTER B. VINoENr, ALFRED I. HILL. 

